linux-kernel - Re: [RFC] block integrity: Fix write after checksum calculation problem

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Message-ID: <20110228084929.GA27227@infradead.org>
Date:	Mon, 28 Feb 2011 03:49:29 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	"djwong@...ibm.com" <djwong@...ibm.com>,
	Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Mingming Cao <mcao@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [RFC] block integrity: Fix write after checksum calculation
 problem

On Tue, Feb 22, 2011 at 09:13:49AM -0700, Andreas Dilger wrote:
> Can you please attach your reproducer? IIRC it needed mmap() to hit this problem?  Did you measure CPU usage during your testing?

Running XFSQA on a DIF target reproduces it.  Even scsi_debug in the
right mode is enough.

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